Siemens SIMATIC S7-1500 Manual page 53

Technical specifications
Article number
OB
•
•
•
•
•
•
•
•
•
•
•
•
•
Nesting depth
•
Counters, timers and their retentivity
S7 counter
•
Retentivity
IEC counter
•
Retentivity
S7 times
•
Retentivity
IEC timer
•
Retentivity
Data areas and their retentivity
Retentive data area (incl. timers, counters, flags),
max.
Extended retentive data area (incl. timers, coun-
ters, flags), max.
52
Size, max.
Number of free cycle OBs
Number of time alarm OBs
Number of delay alarm OBs
Number of cyclic interrupt OBs
Number of process alarm OBs
Number of DPV1 alarm OBs
Number of isochronous mode OBs
Number of technology synchronous alarm OBs 2
Number of startup OBs
Number of asynchronous error OBs
Number of synchronous error OBs
Number of diagnostic alarm OBs
per priority class
Number
–
adjustable
Number
–
adjustable
Number
–
adjustable
Number
–
adjustable
6ES7518-4AX00-1AB0
1 Mbyte
100
20
20
20; with minimum OB 3x cycle of 100 µs
50
3
3
100
4
2
1
24
2 048
Yes
Any (only limited by the main memory)
Yes
2 048
Yes
Any (only limited by the main memory)
Yes
768 kbyte; In total; available retentive memory for
bit memories, timers, counters, DBs, and technol-
ogy data (axes): 700 KB
20 Mbyte; When using PS 6 0W 24/48/60 V DC HF
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB